[diverteach]

Check this site out.

http://www.midwayusa.com/ebrowse.exe/browse?TabID=10&Categoryid=8705&categorystring=657***

[Zeppo]

A couple of suggestions:

First, the Picatinny mount supposedly duplicates Weaver mount specifications. See this page for a diagram of the Picatinny profile.

Also note that Weaver is still in business, so perhaps it would be worth dropping a note to them. Their web site is here.

[Zeppo]

One more thing in case I have misunderstood your question - if you are looking for dimensions and cross sections of the mounts themselves, rather than the rails, that is something that I have been looking for everywhere, and so far I've come up empty-handed. So if that's what you're looking for, and you find it, please point me in the right direction...